Photoionized Plasma in Cygnus X-3

Details Photoionized Plasma in Cygnus X-3 Photoionized Plasma in Cygnus X-3

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48l.113k&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.L113-L116.

Astronomy and Astrophysics

Astronomy

21

Stars: Individual (Cygnus X-3), Stars: Winds, Stars: Wolf-Rayet, X-Rays: Sources, X-Rays: Spectra

Scientific paper

ASCA observations of Cygnus X-3 in its X-ray high-intensity state have for the first time resolved the Kalpha lines from He-like and H-like ions of S, Ar, Ca, and Fe. In addition to these emission lines, we detected an emission-line-like feature at 3.5 keV. We identified this feature as being the free-bound continuum emitted in recombination into the 1(2) S state of H-like S. This is direct evidence of a photoionized plasma in the Cyg X-3 system, which has a dense stellar wind from a Wolf-Rayet companion star irradiated by strong X-rays from the compact star. The electron temperature of this plasma was estimated to be 16(+5}_{-6) eV by measuring the shape of the free-bound continuum.

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